package com.wn.icloud.common.utils;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;

/**
 * @Description excel导入导出工具类
 * @Author WTL
 * @Date 2018/12/5 17:44
 **/
@Component
public class ExcelUtil {
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response) {
        ExportParams exportParams = new ExportParams(title, sheetName);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list, pojoClass, fileName, response, exportParams);

    }

    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, HttpServletResponse response) {
        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));
    }

    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        defaultExport(list, fileName, response);
    }

    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) {
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        try {
            downLoadExcel(fileName, response, workbook);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) throws Exception {
        response.setCharacterEncoding("UTF-8");
        response.setHeader("content-Type", "application/vnd.ms-excel");
        response.setHeader("Content-Disposition",
                "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
        workbook.write(response.getOutputStream());
    }

    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
        try {
            downLoadExcel(fileName, response, workbook);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws Exception {
        if (StringUtils.isBlank(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        return list;
    }

    public static <T> List<T> importExcel(InputStream fileStream, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws Exception {
        if (fileStream == null) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        list = ExcelImportUtil.importExcel(fileStream, pojoClass, params);
        return list;
    }

    public static Workbook getWorkBook(MultipartFile file) throws IOException {
        InputStream is = file.getInputStream();
        Workbook hssfWorkbook = null;
        try {
            hssfWorkbook = new HSSFWorkbook(is);
        } catch (Exception ex) {
            is = file.getInputStream();
            hssfWorkbook = new XSSFWorkbook(is);
        }
        return hssfWorkbook;
    }
}
